Hello everyone. This one has me perplexed so I am hoping for some extra help
I have a 1997 TJ with the 2.5 4 cylinder, automatic. The Jeep runs great, no engine codes, but when the engine warms up, it sounds like a diesel engine and I cannot pipoint the source. Not the exhaust, not the catalytic converter, oil pressure is good, pulleys are all tight, water pump is new. Help!
In other words, it sounds like a 16 year old 2.5L? Mine and many others sound the same. If you can find a cure to make it sound new again please let us know, however that unhealthy sound seems rather common.
Mine has 140,000 and does the same thing. Sounded like it was in the top so i changed the lifters (found 3 of them colapsed), but still makes the same noise after running about 5-10 minutes. If you find the cause let us know.
Mine also uses no oil, runs smooth, just sounds like a diesel.
Mine had ticked for the 3 years I've had it. This Monday the ticking got much, much louder and the Jeep is in the shop now. Might need a rebuild or a new engine. Not sure what went but something bad happened. Never ran bad or overheated even once the loud ticking started.
Mine had a similar problem, found two separate places. One, my air intake was whistling, and second, the donut gasket between the manifold and down-pipe, was shot.
Now it sounds fine.
I hope that helps at least someone here....
... Although, I do have a ticking (like the "60 minutes" stopwatch), it's most prominent when in third gear under load (like getting on an on-ramp). It has me worried, but not enough to take it apart and possibly do more harm than good, or have someone else take it apart and have it do more harm to my wallet.
2000 2.5L 5spd 4.88, HP D30 w/OX, D35 open, 3" "FrAnKeNLiFt" with some stuff... LOOKING FOR Willys Edition TJ rear seat! to match the fronts.